Why when I print my array of objects it shows all null?

Question

I want to create a deck of cards(object), and it shows nullnullnull... however i construct the card.

This is the class I use to initialize the deck:

import black.jack.bean.Card;

public class InitDeck {
    
    public InitDeck() {
        
    }
    
    public void createDeck(Card[] cards) {
        for(int idx = 0; idx<cards.length; idx++) {
            int contValueNum = 1;
            boolean valueYes = false;
            
            cards[idx] = new Card((char) idx, idx);
            
            if(!valueYes) {
                switch(contValueNum) {
                    case 1:
                        cards[idx].setKey('A');
                        cards[idx].setKeyValue(contValueNum);
                    break;
                    case 11:
                        cards[idx].setKey('J');
                        cards[idx].setKeyValue(contValueNum);
                    break;
                    case 12:
                        cards[idx].setKey('Q');
                        cards[idx].setKeyValue(contValueNum);
                    break;
                    case 13:
                        cards[idx].setKey('K');
                        cards[idx].setKeyValue(contValueNum);
                    break;
                }
                
                if(idx==cards.length) {
                    valueYes = false;
                }
            }
        }
    }
    
    public void visDeck(Card[] cards) {
        for(int idx = 0; idx<cards.length; idx++) {
            System.out.print(cards[idx]);
        }
    }
}

This is the class Deck and the class Card

public class Deck {
    
    private static final int CARDS = 52;
    
    //private char[] deck = new char[CARDS];
    protected Card[] cards = new Card[CARDS];
    
    public Deck() {
        
    }

    public Card[] getCards() {
        return cards;
    }

    public void setCards(Card[] cards) {
        this.cards = cards;
    }
}

public class Card {

    public char key;
    public int  keyValue;
    
    public Card(char key, int keyValue) {
        this.key      = key;
        this.keyValue = keyValue;
    }

    public Card() {
        
    }
    
    public char getKey() {
        return key;
    }

    public void setKey(char key) {
        this.key = key;
    }

    public int getKeyValue() {
        return keyValue;
    }

    public void setKeyValue(int keyValue) {
        this.keyValue = keyValue;
    }
}

And this is my Console

public class Console {
    
    public Console() {
        
    }

    public void execute() {
        InitDeck initDeck= new InitDeck();
        Deck deck = new Deck();
        Card card = new Card();
        
        initDeck.visDeck(deck.getCards());
    }

}

And the result is:

nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull

There's someone who could help me out?